.mainContainer {
    overflow: hidden;
    width: 1200px;
    margin: 0 auto;
}

.mainContainer .column1 {
    float: left;
    padding-right: 15px;
    width: 250px;
}

.mainContainer .column1 ul li {
    background-color: #f6f6f6;
    padding: 20px;
}

.mainContainer .column1 ul li span a {
    font-size: 14px;
    font-weight: 700;
}

.mainContainer .column1 ul li .adv {
    display: flex;
    align-content: space-between;
    flex-wrap: wrap;
}

.mainContainer .column1 ul li .adv a {
    margin: 5px 20px 0 0;
}

.mainContainer .column1 ul li:nth-child(2n) {
    background-color: #e9e7e6;
}

.mainContainer .column2 {
    padding-top: 10px;
    float: left;
}

.mainContainer .column3 {
    width: 255px;
    float: left;
}

.mainContainer .column3 .imgdv {
    padding: 10px 0 0 15px;
}

.mainContainer .column3 .imgdv a img {
    width: 245px;
    height: 113px;
    margin-bottom: 10px;
}